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    <title>“SharedMemories”共同记忆</title>
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    <!-- 导航栏设计 -->
    <ul class="w3-bar w3-border w3-card-4 w3-light-grey" >
        <!-- <li id="zhugan" ><a href="#">&emsp;&emsp;Shared Memories&emsp;&emsp;</a></li> -->
        <li><a href="主页.HTML" class="w3-bar-item w3-button">&emsp;主页&emsp;</a></li>
        <li><a href="参与.html" class="w3-bar-item w3-button">&emsp;参与&emsp;</a></li>
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                <a href="https://www.supermap.com/zh-cn/" > 
                <input type="button" value="北京超图 supermap iclient" class="btn2"></a>
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